#! /bin/bash

echo -n "please input 2 number >:"
read num1 num2
echo "num1=$num1, num2=$num2"

ret=`expr $num1 + $num2`
echo "$num1 + $num2 = $ret"

ret=`expr $num1 - $num2`
echo "$num1 - $num2 = $ret"

ret=`expr $num1 \* $num2`
echo "$num1 * $num2 = $ret"

ret=`expr $num1 / $num2`
echo "$num1 / $num2 = $ret"

ret=`expr $num1 % $num2`
echo "$num1 % $num2 = $ret"

